My tip would be, unless you are building a show quality deal to avoid the QC. Realistically you are looking at somewhere between 150-200mph, likely the lower end of that and you can get the gear set you'll need in a diff that is cheap, and easy to find parts for. The other issue is a QC will absorb a bit of power, and they're big.
Don't want to be a party pooper but racing is more fun than fixing or paying for things.